Telling supporters the party had 10 days to "realise our hopes and dreams", he said the election was different to those of the recent past as Labour was "truly taking on the establishment" which had seen the country's wealth gather at the top.
On who will keep the United Kingdom safe from terrorism, voters back Theresa May over Mr Corbyn by a huge 42%-16% margin, while she has a 26-point lead (42%-16%) over who is the best leader to oversee Brexit negotiations.
Although the results are less dramatic than Friday's YouGov survey, which found the Conservative advantage squeezed to just five points, they tally with the trend in a number of polls which have shown Labour gaining on the Tories after having begun the election race as much as 25 points adrift.
"The Tory manifesto has plunged pensioners and working people into insecurity, and left our public services facing the risk of further crisis".
The Opinium poll found Mrs May's approval ratings had slumped from plus-17 to plus-11 over the week, while Mr Corbyn's rose from minus-18 to minus-11.
However the Conservatives enjoy equally substantial leads on immigration, negotiating Brexit and security - an issue which has come to the forefront of the campaign since the Manchester bombing.
A clutch of General Election polls showed the Tory lead over Labour shrinking, with one new poll by ORB for the Sunday Telegraph putting Mrs May's party just six points clear, and another by YouGov for the Sunday Times recording the gap as seven points.More news: Manchester bombers 'could still be at large'
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The opposite is true of Labour leader Corbyn, with 39percent saying they have a more positive view of him compared with 14 percent who now have a more negative view.
Mr Corbyn said he has been vocal in opposing "executive control orders that are not subject to judicial oversight" as he defended his previous voting record on anti-terror measures. Defence secretary Michael Fallon said Mr Corbyn was blaming Britain for the Manchester attack when the Labour leader said last Friday that there was a link between Britain's foreign policy and terrorism.
May has said now is not the time to discuss a fresh independence vote.
"The only thing Corbyn would sign is our security away".
Home Secretary Amber Rudd wrote to Conservative supporters on Sunday evening saying Corbyn and his home affairs spokeswoman Diane Abbott "simply can not be trusted to keep our country safe", citing their record of voting against anti-terror laws and opposing the work of the security services. "We think in the end as well as global intervention, you've got to have negotiation", Ms Abbott said.
She also pointed to the importance of community policing and highlighted cuts that had been made in this area. "Supposing the alleged Manchester bomber's mother had felt confident to approach the authorities and say she was anxious about her son, so many lives would have been saved". "But our enjoyment of Britain's diversity must not prevent us from confronting the menace of extremism, even if that is sometimes embarrassing or hard to do" - Theresa May in an interview with the Sunday Express.