All 4 Uses

adapt
in
Flags of Our Fathers
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Amoskeag never saw it coming and was too unwieldy to adapt.†
Chpt 2. *

adapt = change to fit a different situation; or make suitable
Accepting the benevolent control of their gigantic employer, content with its definition of them as the "corporation's children," these rural men and women (and their children) adapted themselves to the terrain—both physical and psychological—of their new urban life.†
Chpt 2.
The ex-footballer who had once craved some of Leo Ryan's "boards" for his football pants now adapted some of Mike's mannerisms: Like Mike, he wore his helmet cocked to one side.†
Chpt 5.
For the risky mission he'd armed himself with a stinger gun, a light machine gun he'd taken from an airplane and adapted into a rapid-fire gun.†
Chpt 7.

Definitions:

(1) (adapt as in: adapted to the new rules)
changed to fit a different situation; or made suitable
(2) (adapted as in: the species is well adapted for)
to be especially well suited or appropriate for something
(3) (meaning too rare to warrant focus)