drop back is a verb meaning "take position in the rear, as in a military formation or in the line of scrimmage in football". It carries 2 recorded senses.
take position in the rear, as in a military formation or in the line of scrimmage in football
“The defender dropped back behind his teammate”
to lag or linger behind
“But in so many other areas we still are dragging”
Definitions, synonyms and semantic relations for drop back come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.