This is the 320th most frequent German word.
blieb
"Blieb" means "stayed" or "remained" in English.
In this sentence, 'blieb' is the past tense of 'bleiben', indicating the action of staying or remaining in a place.
Er blieb zu Hause, weil es regnete.
He stayed at home because it was raining.
In this context, 'blieb' emphasizes the maintenance of an emotional or physical state, here being calm.
Trotzdem blieb er ruhig.
Nevertheless, he remained calm.
Here, 'blieb' is used to indicate the continued state of the door being locked, implying a static or unchanged condition.