redoubt

noun

1. (military) a temporary or supplementary fortification; typically square or polygonal without flanking defenses

Definition categories: man–made, fortification, munition

2. an entrenched stronghold or refuge

Definition categories: man–made, fastness, stronghold

verb

1. (transitive) To fortify, to make into a stronghold.

2. (archaic) To dread.

3. (rare) To doubt again.