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