συμπιασθῆναι
From LSJ
τοῦ δὲ πολέμου οἱ καιροὶ οὐ μενετοί → in war, opportunities won't wait | the chances of war will not wait (Thucydides 1.142.2)
Dutch (Woordenboekgrieks.nl)
συμπιασθῆναι, inf. aor. pass. van συμπιαίνω of van συμπιέζω (afleiding onzeker).