Erstwhile and One shot

Erstwhile adverb - At an earlier or previous time.

One shot and erstwhile are semantically related In some cases you can use "One shot" instead an adverb "Erstwhile".

One shot noun - A charge of ammunition for a single shot.

Erstwhile and one shot are semantically related in earlier topic. Sometimes you can use "Erstwhile" instead an adverb phrase "One shot".