verb
ensure
in-SHUR/ɪnˈʃʊr/
To make certain that something happens or is true.
The wedge ensures that the door stays open.
Etymology
To ensure is literally to make sure. The older idea of making something safe or secure connects with making an outcome certain—securing it against the possibility of failure.
In context
availability of witnesses is a common reason for requesting a continuence. If a key witness is unable to attend the scheduled hearing or trial, a delay may be necessary to ensure their testimony can be heard.