سيتهى doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has an entry for it. Select the entry below for the full classical Arabic definition.

• سَيْتَهِىٌّ

  سَيْتَهِىٌّ ذ , thus correctly, in the handwriting of Sgh, on the authority of Fr; in the K, ; (TA;) One who always walks, or goes, at the rear of a people, or party, (IB, K, TA,) remaining behind them, and looking to th…

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