too big for your boots

too big for (one's) boots

Overconfident in one's importance, skill, or authority; behaving as if one is more important or influential than one actually is. He's gotten too big for his boots ever since he got that promotion. John's been too big for his boots now that he's been scouted by pro teams.
See also: big, boot
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

too big for your boots

BRITISH, INFORMAL or

too big for your britches

mainly AUSTRALIAN, INFORMAL
If someone is too big for their boots, they behave as if they are more important or clever than they really are. Note: In the second expression, `britches' is also spelled `breeches'. I was often accused of being too big for my boots. If you ask me, he's too big for his britches since he struck it rich. Note: You can also say that someone gets too big for their boots or gets too big for their britches. In Britain, people seem to have a thing about not letting someone get too big for their boots. Getting too big for their britches, kids these days. Think the whole universe should revolve round them. Note: Britches are trousers which reach as far as your knees.
See also: big, boot
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

too big for your boots

conceited. informal
See also: big, boot
Farlex Partner Idioms Dictionary © Farlex 2017

too ˌbig for your ˈboots

(informal) thinking that you are more important than you really are: His political rivals had decided that he was getting too big for his boots.
See also: big, boot
Farlex Partner Idioms Dictionary © Farlex 2017
See also:
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A Too Big for Your Britches B Big Shoes C Too Big for Your Boots D Boots Don't Fit 5.
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