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Sanakirja

on the sly []

a titokban [tˈitokbɑn]

a alattomban [ˈɑlɑtːombɑn]

a stikában [ʃtˈikaːbɑn]

a (idiomatic) slyly | Slyly, in an inconspicuous manner, so as not to be seen; secretly; stealthily.