hunker down
US /ˈhʌŋkər daʊn/
UK /ˈhʌŋkər daʊn/

1.
to take shelter in a safe place, especially for a period of time
:
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We decided to hunker down in the basement during the tornado.
•
The family had to hunker down for the night as the storm raged outside.
2.
to prepare for a difficult or challenging period
:
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Businesses are hunkering down for a potential economic downturn.
•
We need to hunker down and focus on our core objectives.