"Lemme see ..."

• Sound that indicates "I wonder ..."
• "Let's see ... "
• "Let's see here ..."
• "Let me think... "
• "Wait, it'll come to me ..."
• What you might say after reading a tricky crossword clue
• 'Let me see ...'
• "Good question ..."
• "I've gotta think ..."

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
representative of a sound made during contemplation or showing mild disapproval, attested from 1868, but this is probably a variation of the hum attested in similar senses from 1590s.