Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
con-stīpo, āvi, ātum, 1, v. a., to press or crowd closely together (very rare): tantum numerum hominum in agrum Campanum, * Cic. Agr. 2, 29, 79: se (hostes) sub ipso vallo, Caes. B. G. 5, 42; Prud. στεφ. 11.