sign on the dotted line
US /saɪn ɑn ðə ˈdɑtɪd laɪn/
UK /saɪn ɑn ðə ˈdɑtɪd laɪn/

1.
在虛線上簽字, 正式同意
to formally agree to something by signing a document
:
•
After much negotiation, he finally agreed to sign on the dotted line.
經過多次談判,他終於同意在虛線上簽字。
•
Are you ready to sign on the dotted line and commit to this project?
你準備好在虛線上簽字並承諾參與這個項目了嗎?