You're helping your girlfriend shop for a used car. She find a car that she might want to buy, but she's not sure if it's a good choice. She can't make up her mind, so she asks you what you think. But you can't decide either, so you say:
It's your call.
This phrase means "You should decide." You say this to someone when you think they should be the person to make the final decision about something. For example, you might say this to your boss who doesn't seem satisfied with the work that you've done:
A: Hmmm... I'm not sure about this. I don't think we should release it to the public yet.
B: OK. It's your call.
This phrase is similar to this expression:
But "It's your call" carries more of a sense that the decision is the responsibility or right of the person who you're speaking to. In other words, that person should make the decision. "It's up to you" can also mean that you're letting the other person make the decision.
"It's your call" is also similar to this phrase:
It's your decision.
But "call" is more casual than "decision".
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