to topple /ˈtɑːpəl/ /ˈtɒpəl/
to capsize /ˈkæpˌsaɪz/ /kæpˈsaɪz/
to topple over
to overturn /ˌoʊvərˈtɜːrn/ /ˌəʊvəˈtɜːn/
to fall down /fɔl daʊn/ /fɔːl daʊn/
to crash /kræʃ/ /kræʃ/
to be overthrown
to be toppled