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