What does steal someone's thunder mean?

To take credit or attention away from someone.

Code Busters level guide

Code Busters Level 145 Walkthrough

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Level 145 is an illustrated Idioms puzzle whose answer is Steal someone's thunder.

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Read the stage illustration as a clue about taking attention from another performer.
Reveal STEAL first; it exposes 25 = S, 9 = T, 2 = E, and 20 = A plus the seeded L.
Reveal SOMEONE'S second, exposing 11 = O, 3 = M, and 23 = N while preserving the apostrophe-S.
Reveal the bandaged, masked THUNDER. ending third and retain its period.
Confirm the STEAL → SOMEONE'S → THUNDER reveal order.
Verify the definition: to take credit or attention away from someone.

Dropping the apostrophe in SOMEONE'S.
Choosing another attention-related idiom that does not fit the seven masked cells.

Use the picture to identify the idiom, then reveal STEAL, SOMEONE'S, and THUNDER in that order.
Count seven cells for THUNDER and preserve the apostrophe in SOMEONE'S.

Board notes 5 details

Layout: A stage illustration sits above two answer lines with a selected cell, feather cell, red key cell, purple bandage, seven-character masked word, seeded L/E letters, three mistake circles, and hammer/wand helpers.
Goal: Complete STEAL SOMEONE'S THUNDER and confirm the definition about taking credit or attention away from someone.
Opening: The recorded wand order is STEAL, SOMEONE'S, then the masked THUNDER ending; the revealed words expose 25 = S, 9 = T, 2 = E, 20 = A, 11 = O, 3 = M, and 23 = N.
Danger Zone: SOMEONE'S needs its apostrophe-S, while THUNDER is a separate seven-letter word followed by the final period.
Mechanics: An Idioms board that combines a visual stage clue with three consecutive word reveals, a bandage, masked second line, key cell, and a completion-card definition.

What is the Code Busters Level 145 idiom?
Steal someone's thunder.
What does steal someone's thunder mean?
To take credit or attention away from someone.