The Daggers were plunged further into the relegation mire as they slipped to a late and potentially damaging defeat at Home Park last night.
With Argyle starting the day just outside the drop zone, but only four points above the Daggers, it was a match John Still's team could not afford to lose if they were to avoid falling further adrift of safety.
But after a fast start, in which Gavin Tomlin scored a cracking first goal for the club, the Daggers once again failed to take their chances and mad e the long trip home with nothing to show for their efforts.
The starting XI showed two changes from Saturday's home defeat against Oldham, with Liverpool loanee Victor Palsson coming into midfield in place of the injured Solomon Taiwo while Tomlin was preferred to Jon Nurse up front.
However, for the second time in three weeks, the Daggers were forced to make a change in goal before the kick off as Chris Lewington pulled a muscle in the warm up and was replaced by Tony Roberts, his first appearance since he too was forced out at Southampton earlier this month.
But despite all the pre-match disruption Still's side started well and took the lead inside ten minutes. Medy Elito broke with pace down the left and his cross was beautifully volleyed home by the late-arriving Tomlin, a great way to score his first goal for the club since his summer transfer from Yeovil.
The hosts briefly rallied, with Roberts alert to save a Rory Fallen header five minutes later, but it was the Daggers who looked to increase their lead before the break. Tomlin was hungry for more goals and he forced Pilgrims keeper Romain Larrieu into a fine near post save in the 27th minute= before then firing over the top after a powerful run into the home penalty area two minutes later.
It was a similar story in the opening minutes of the second half as the visitors looked to seal a second consecutive away win. Kayleden Brown fired into the side netting a minute after the resumption while only a fine last-ditch tackle from Argyle defender Stephane Zubar denied Romain Vincelot his 6th goal of the season.
But just as it appeared the Daggers were gaining control of the match Argyle conjured up an equaliser out of nothing. Captain Craig Noone skipped past several challenges before cutting in from the bye-line and poking the ball past a stunned Roberts from close range.
That seemed to lift Peter Reid's men and they almost went in front moments later when Icelandic midfielder Kari Arnason found himself in space inside the Daggers area, but he somehow screwed his shot wide of the post from the edge of the six yard box.
The visitors continued to create chances of their own and Vincelotheaded narrowly over the top from a Danny Green corner before then hooking a shot wide from another Green set piece as the Pilgrims defence began look vulnerable.
With the points so important to both sides there was inevitably chances at either end in a frantic last twenty minutes. Tomlin was inches away from converting a cross from Green in the 72nd minute while at the other end Chris Clark fired straight at Roberts in what proved to be his last meaningful contribution to the match.
Manager Reid almost immediately replaced him with Joe Mason and it was to prove an inspired decision as the substitute made an immediate impact. He displayed a great first touch to push a pass from Noone into the path of fellow substitute Rory Patterson and the Irishman drilled a shot beyond the Daggers keeper to give the hosts the crucial breakthrough with just seven minutes remaining.
Still threw on Bas Savage in an attempt to salvage at least a point from the evening but it was to no avail and in fact it could been even worse for his team as Bradley Wright-Phillips and Conor Clifford both came close to adding a late third for Argyle.
That would have been hard on a Daggers side who had once given everything only to come home empty handed and, with results elsewhere not going in their favour, they are now six points from safety with almost half the season gone.
Attendance; 4,960 (56 away)