What does this idiom mean: to show your hand very often?

[Showy]

English Language Tests, Intermediate level

ESL/EFL Test #707 "English Slang Idioms (449)", question 7

"Tommy isn't a very trusting soul, is he? He wouldn't even tell me where he lived for almost a year," Matt said. Ronald replied, "No, he doesn't show his ......... very often."

(a) foot
(b) hand
(c) face
(d) heel

English Language Tests, Intermediate level

ESL/EFL Test #707 "English Slang Idioms (449)", answer 7

"Tommy isn't a very trusting soul, is he? He wouldn't even tell me where he lived for almost a year," Matt said. Ronald replied, "No, he doesn't show his hand very often."

Correct answer: (b) hand
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what's the answer of this question

[Mister Micawber]

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The answer is directly above your question.
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Native English teacher at Mister Micawber's

[Ceo Neeraj]

Hi Mister,

What does "show his hand" means?
Is it a standard idiom?
Please help.

[Mister Micawber]

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Yes, it is common. — 'show one's hand' (also 'show one's cards')
1: to display one's cards face up
2: to declare one's intentions or reveal one's resources.
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Native English teacher at Mister Micawber's