在词典中可以查到的 lie back，它的意思是“向后躺，向后仰”（= to move the top half of your body from a sitting to a lying position），侧重指上半身向后躺或向后仰；它与 lie on one’s back 在意思上稍有不同，后者的意思是“仰面躺着”，指整体身体是平躺着的。比较：

Her son was lying peacefully on his back. 她儿子安静地仰面躺着。

He lay back in the reclining chair and went to sleep. 他向后躺在躺椅上睡着了。

He put his feet up on the desk and lay back in his chair. 他把脚搁在桌子上，身体后仰在椅子上。

She lay back in the dentist's chair and tried to relax. 她向后躺在牙医的椅子上，尽量让自己放松下来。