to let slip an opportunity

an opportunity to pass away, or escape, or be lost

not letting a chance go

give up, lose

not to let slip an opportunity

of an opportunity to skip past

pass-out time to do something, to miss the opportunity, to lost the opportunity

to let slip an opportunity

a combustible material, an explosive

to do work in time, do not miss the time

lose one's courage

cajole or appease (by touching someone's chin), flatter

lose one's courage