Hesitate to show signs of lumbago (4,4)

I believe the answer is:

hold back

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'hesitate' is the definition.
(I know this)

I don't understand how the rest of the clue works.

(Other definitions for hold back that I've seen before include "restrain from action" , "check" , "Sufferer from lumbago" , "Refrain -- restrain -- retain" , "Hesitate" .)

I've seen this clue in The Globe and Mail.

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