Meaning
To let a word slip out accidentally.
Literally: the tongue slips
See it in the verse
Zabaan phisalna in Iqbal’s couplets
Hazar khauf ho lekin zaban ho dil ki rafiq
Yahi raha hai azal se qalandaron ka tariq
Yahi raha hai azal se qalandaron ka tariq
Let there be a thousand fears, yet let the tongue stay true to the heart; this has been the way of free spirits since the beginning of time.
Courage · Selfhood · Self-Knowledge
Aazad mujh ko kar de o qaid karne wale
Main be-zaban hun qaidi tu chhod kar dua le
Main be-zaban hun qaidi tu chhod kar dua le
Set me free, you who keep me caged; I am a voiceless captive, release me and earn a blessing.
Freedom · Justice