to use / to employ / to make use of, to apply / to spend

gap; space / (specifically) gap in defenses

spade

護る: to protect, to defend / to watch carefully / to abide (by rules), to observe (regulations)

(archaic) to stand watch over something, to be on the lookout for something (such as a watchman controlling entry to a place) / (archaic) to protect or defend something, to ensure that something is safe

(Classical Japanese) to be watching continuously, to be on watch repeatedly, to be on look out / (Classical Japanese) to protect something, to take care of something

(Classical Japanese) to be watching continuously, to be on watch repeatedly, to be on look out / (Classical Japanese) to protect something, to take care of something

(Classical Japanese) to be watching continuously, to be on watch repeatedly, to be on look out

(slang) avoiding someone because has a crush on them

(idiomatic) tears (drops from the eyes)