to bring (something) to a more satisfactory or correct state by a minor change or adaptation; to regulate, correct, or modify (something)

You will have to adjust your lifestyle to suit your income

to adapt oneself, e.g. to a new environment or different conditions

to determine the amount to be paid under an insurance policy in settlement of (a loss)

(often + to) to adapt or conform oneself, e.g. to a new environment or different conditions