extend and contract / extension and contraction / expand and contract / lengthen and shorten / lengthen and shrink / be elastic / lengthening and shrinking
のびちぢみする
nobichijimisuru
伸縮みする JN1;JVE
be stretchy / expand and contract / lengthen and shorten / be flexible / be elastic
のびのびする
nobinobisuru
伸び伸びする JVE
take it easy / kick back / be free and easy / relax / breathe easy / be carefree
ゆうゆうたる
yuuyuutaru
優優たる JAM
feel at ease / spread far and wide / be free from all cares / free-and-easy / be relaxed / light-hearted / carefree