It just means they smiled. Perhaps they were trying to hold back a smile, but they grinned nonetheless.
Started smiling, probably used like "Cracked a smile", when the person "cracking a grin" smiles, even though you wouldn't expect it.
It made me laugh very much.
An early meaning of "crack" included boasting, bragging, and talking big. "Not all it's cracked up to be" refers to this meaning. It's not used in the literal sense of a nut being cracked or a block having a crack in it.
It is not an idiom, it means your nose is itching.
idiom means expression like a page in a book
Started smiling, probably used like "Cracked a smile", when the person "cracking a grin" smiles, even though you wouldn't expect it.
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Grin means to smile happily
It made me laugh very much.
Eye-brow raiser is an idiom that is accompanied by a raise of the eyebrow and a slight grin it can mean "acknowledgment" or when you're trying to chat up a girl from the other side of the room.
Eye-brow raiser is an idiom that is accompanied by a raise of the eyebrow and a slight grin it can mean "acknowledgment" or when you're trying to chat up a girl from the other side of the room.
Imagery
Great big grin
An early meaning of "crack" included boasting, bragging, and talking big. "Not all it's cracked up to be" refers to this meaning. It's not used in the literal sense of a nut being cracked or a block having a crack in it.
The future tense of "grin" is "will grin."
It means the knee is cracked.
It's not really an idiom. It means "what are you thinking about."