shelter-in-place

Short definition from Wiktionary

Noun

1. 1
   A strategy for avoiding danger, such as gun violence, a hurricane, etc., in which individuals remain inside the building they happen to be in at the time of the danger rather than evacuating and seeking refuge elsewhere.

Verb

1. 1
   Alternative form of shelter in place.
2. 2
   To follow a shelter-in-place strategy.