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be (not) supposed to (do something)
To be expected to do something. Often used in the negative when one is expected to avoid doing something. I'm supposed to watch my little sister tonight, so I can't go out with you guys. You're not supposed to play with dad's tools when he's not home!
What's that supposed to mean?
What is someone suggesting, alluding to, or insinuating? Often used when angered or irritated by what was said. What exactly is that supposed to me? I have never taken a bribe in my entire life, if that's what you mean! A: "Of course, you wouldn't know anything about a hard day's work." B: "Hey, what's that supposed to mean? I work hard!"
(It's) not supposed to.and (Someone's) not supposed to.
a phrase indicating that someone or something is not meant to do something. (Often with a person's name or a pronoun as a subject. See the examples.) Fred: This little piece keeps falling off. Clerk: It's not supposed to. Bill: Tom just called from Detroit and says he's coming back tomorrow. Mary: That's funny. He's not supposed to.
supposed toand someone or something is supposed to
Someone or something is meant to do something. (Frequently, in speech, supposed is reduced to s'posed. The words someone or something can be replaced with nouns or pronouns, or used themselves.) Mary: They didn't deliver the flowers we ordered. Sue: Supposed to. Give them a call. Sally: This screw doesn't fit into hole number seven in the way the instructions say it should. Bill: It's supposed to. Something's wrong.
supposed to do something
expected or intended to do something; obliged or allowed to do something. You're supposed to say "excuse me" when you burp. Mom says you're supposed to come inside for dinner now.
1. Intended to; also, believed to, expected to. For example, This pill is supposed to relieve your pain, or You're supposed to be my partner. [Early 1300s]
2. Required to, as in He is supposed to call home. [Mid-1800s]
3. not supposed to. Not permitted to, as in You're not supposed to smoke in here.
(not) be supˈposed to (do something)
1 (not) be expected or required to do something by rules, the law, an agreement, etc: She’s supposed to do an hour’s homework every evening. ♢ We’re not supposed to be at the party for an hour yet.
2 (used only in negative sentences) be not allowed to do something: You’re not supposed to walk on the grass.