hiding place 
noun
A place for concealing someone or something: he took the revolver from its hiding place...
- The islands and sheltered bays provided ideal hiding places for the pirate galleys that plundered passing ships.
- With crowds around the whole course there were no hiding places.
- After she heard the man drive away, she emerged from her hiding place, but was too scared to flag down the first few vehicles in case it was him.
Synonyms
hideaway, hideout, retreat, refuge, den, shelter, sanctuary, bolt-hole, foxhole, lair, safe house, asylum, sanctum, hermitage, oasis, haven, harbour, place of safety
informal hidey-hole