never say die (?.)

• be determined
• be hopeful
• be in earnest
• be resolved
• bear up
• buckle down
• buckle to
• catch at straws
• come up fighting
• cross the Rubicon
• die fighting
• die hard
• get along
• get on
• go for broke
• go on
• go on with
• hang in
• hang in there
• hang on
• hang tough
• hold fast
• hold on
• hold out
• hold up
• keep at it
• keep hope alive
• keep hoping
• keep up
• knock on wood
• live through it
• live with it
• make out
• manage
• mean business
• not back down
• not flag
• not give up
• not submit
• not weaken
• persevere
• persist
• remain firm
• see it out
• see it through
• stand fast
• stand up
• stay it out
• stay the distance
• stay with it
• stick
• stick fast
• stick it
• stick it out
• stick out
• stick to it
• stick with it
• survive
• sweat it out
• take heart
• take it
• take the plunge
• tough it out