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A hairline can do it, 6 letters
Become more distant, 6 letters
Diminish, as a threat, 6 letters
Disappear, like a hairline, 6 letters
Give ground gradually, 6 letters
Go back, as a hairline, 6 letters
Inch back slowly, as a hairline, 6 letters
Many hairlines do it, 6 letters
Many men's hairlines do this, 6 letters
Move like a hairline, 6 letters
Retreat, like a hairline, 6 letters
Reveal more forehead, 6 letters
Became more distant, 7 letters
Moved, like many hairlines, 7 letters
Went back, as a hairline, 7 letters
Moves back, as a hairline, 7 letters
What a hairline sometimes does, 7 letters
Like some hairlines, 8 letters
Like the outgoing tide, 8 letters
Become faint or more distant, 8 letters
A slow or gradual disappearance, 8 letters
A act of becoming more distant, 8 letters
Pull back or move away or backward, 8 letters