to place (something) between two things or in an intervening position
to introduce (something) by way of interference or intervention
The chairman prevented a decision by interposing a veto
to interrupt with (words) during a conversation or argument
to be or come in an intervening position
to interrupt
interposer noun
interposition /-pəʹzish(ə)n/ noun
[early French interposer, from Latin interponere to put between, from inter- + ponere to put]