Terra was friendly with Bill, but only when he was at arm's length.

The meaning of the idiom at arm's length is:
• confront or accept an unpleasant or difficult situation
• to act in direct opposition to or defiance of
• to express a strong emotion, usually rage
• at a distance, avoiding intimacy or familiarity

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at a distance, avoiding intimacy or familiarity

]Terra was friendly with Bill, but only when he was at arm's length.

The meaning of the idiom at arm's length is:
• at a distance, avoiding intimacy or familiarity

• at a distance, avoiding intimacy or familiarity