on the sly

Adverb

 * 1)  Slyly, in an inconspicuous manner, so as not to be seen; secretly; stealthily.

Translations

 * Azerbaijani: əlaltından, əlaltı
 * Chinese:
 * Mandarin: ,
 * Dutch: in het geheim
 * Finnish: ,
 * French:, , ,
 * Galician: ás agachadas
 * German:
 * Hungarian:, , ,
 * Polish:
 * Russian:, , , , ,
 * Spanish: de extranjis
 * Swedish: