glib tongue; deceptive eloquence
This is a common misspelling of 舌先三寸 (したさきさんずん), which means smooth talk or flattery used to deceive. The entry exists to document the error; learners should use 舌先三寸 instead.
See also: 舌先三寸 (したさきさんずん)
The form 口先三寸 is listed in dictionaries as an error for 舌先三寸.
This is the correct form meaning 'glib tongue' or 'smooth talk used to deceive'. 口先三寸 is a common misspelling.
A common error for 舌先三寸, likely arising from confusion between 口 (mouth) and 舌 (tongue). The correct expression uses 舌先 (tip of the tongue) and 三寸 (three sun, about 9 cm), metaphorically describing a tongue that is only three sun long but can produce deceptive eloquence.