becalm, be calm

Becalm or becalm ( one word ) means to strand a sailing vessel because it has no wind to propel it--
This weather might becalm the ship, and we'll run out of supplies before we reach land.
One part of the ocean is said to becalm ships regularly.

Be calm or be calm ( two words ) to ( be ) free from wind or motion, literally, or free from agitation or excitement, figuratively--
I hope the weather will be calm tomorrow; I promised to take the children on a picnic.
I know it's upsetting, but try to be calm.

Now that you know that, you can say--
"It's important to be calm; even the doldrums can't becalm our boat forever."