Ignore pain, leave it on the field and never back down.

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We will never back down on this issue.

NPR: Calderon's Swearing-In Marred by Violence

He'd never back down that one.

BBC: South East Wales - Boxing Beats: Fighting Pretty

In such conflicts, both sides are compelled by the fear of appearing weak or irresolute to not only match, but to raise, the level of pressure or threat against the other in recurring rounds of provocation and response, and to never back down.

FORBES: Connect

We have an obligation as Americans, those of us in public life have a great deal of obligation than others never ever to back down.

CENTERFORSECURITYPOLICY: Rep. Peter King: Keeper of the Flame 2012

John doesn't back down and he never gives up.

CNN: STORY HIGHLIGHTS

Medway said that it is hard to compare studies from different wars but that duration does point to a key problem in the current conflicts, since many troops are redeploying after a year, meaning the family never really gets a chance to settle back down.

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The teenager was never going well on Monday and finally gave up the ghost down the back stretch of the second and final lap.

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Analogously, a hot cup of coffee will always cool down if left - it will never draw warmth from a room to heat back up.

BBC: Entropy law linked to intelligence, say researchers

For politicians, they don't want to think big because if they never get there, then they'll be accused of overselling and coming up short, or having to back down from a big announcement.

CNN: Commentary: Obama's ambitious agenda a good thing