to refuse to stop trying to do something.

What I liked best about hiking with this group of people was that they would never say die!

• be first past the post
• be fit to be tied
• be flat broke
• be flesh and blood
• be floating on air
• be flying high
• be footloose and fancy-free
• before can say Jack Robinson
• before could blink
• before know it
• before knows what hit
• before knows what hit them
• before last
• before long
• before someone could blink
• before someone knows what hit
• before someone knows what hit them
• before time
• before you can say
• before you can say Jack Robinson
• before you can say something
• before you know it
• before your time
• be for the asking
• be for the best