to change something slightly to make it more suitable for a new set of conditions or to make it work better

to get used to a new situation by changing the way you behave and/or think

They'll be fine—they just need time to adjust.

After a while his eyes adjusted to the dark.

It took her a while to adjust to living alone.

It can be difficult to adjust to being a parent.

You'll quickly adjust yourself to student life.

My eyes were still trying to adjust themselves to the strong sunlight.

to move something slightly so that it looks neater or feels more comfortable

He smoothed his hair and adjusted his tie.

LEARNit Dictionary