Commonly-Used Idioms, Sayings and phrasal verbs - Saigontre

on (someone`s) back/case
- making demands or criticizing someone, being an annoyance or bother to someone
My boss has been on my back all week trying to get me to finish my monthly report.
on (someone's) behalf
- acting as someone's agent, acting for the benefit of someone
I was able to sign for the registered letter on my wife's behalf.
on (someone's) doorstep
- in someone's care, as someone's responsibility
The responsibility for feeding the extra staff suddenly arrived on my doorstep.
on (someone's) head
- on someone's own self (often used with blame)
The responsibility for fixing the computer was again on my head.
on (someone or something's) last legs
- to be almost worn out or finished
My computer is on its last legs and soon I will have to buy another one.
on (someone's) say-so
- with someone's permission or authority
I was able to ask for a new stove on the apartment manager's say-so.
on (someone's) shoulders
- to be someone's responsibility
The responsibility for organizing the office is always on my shoulders.
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