It's too tight across the back.

背部太紧。

《牛津词典》

They then made their way together back again across the river.

然后，他们又一起回到河对岸。

youdao

He gave the donkey a whack across the back with his stick.

他用棍子在驴背上狠狠打了一下。

《柯林斯英汉双解大词典》

She made speeches about flying. And she continued to fly by herself across the United States and back.

VOA: special.2010.05.26

She looks up at the telephone wires, and she thinks about all the messages, unintelligible, full of human longing, going back and forth across those wires.

她看着电话线，想着那些莫名其妙的，充满了人类欲望的信息电线上来回踱着步。

耶鲁公开课 - 1945年后的美国小说课程节选

was go to the bridge and walk across the other side and then walk back.

就是到桥上走走，从桥这边走过去再走回来。

鲜为人知的名胜 - SpeakingMax英语口语达人

Remember that USS Enterprise-esque ocean research vessel we first ran across back in 2005?

ENGADGET: SeaOrbiter to begin construction by year's end, project price tag clocks in at $52.7 million

When I caught him and climbed back aboard, I couldn't see the wounds across my back, but I saw my fellow riders' faces.

WSJ: A Horse-Crazy Girl's Separation Vacation

In the past 17 games stretching back to last season, the team has fielded 10 different combinations across the back line and goalkeeper as they scrambled to find their best lineup.

WSJ: Red Bulls Defense: A Work in Progress Without Progress