What does "transition of glideslope intercept waypoint" mean in the 737 FCOM? In the Boeing 737NG FCOM, I've read this statement:

VNAV mode is terminated by any one of the following:

selecting another pitch mode
glideslope capture
reaching end of LNAV route
transition of glideslope intercept waypoint if G/S is armed
crosstrack deviation exceeds twice the RNP value during PTH descent for
an active leg with a database vertical angle and LNAV not engaged

In the event of glideslope intercept waypoint transition, VNAV can be re-engaged.

What does &quot;transition of glideslope intercept waypoint if G/S is armed&quot; mean here?
As a generic (non-737 specific) answer, it means that when the Flight Director is armed to capture an ILS glideslope, the VNAV flight director mode, being a vertical path based on baro altitude, is cancelled once the aircraft passes through a waypoint that the RNAV system calculates to be the geographical intercept point of the ILS glideslope beam (the intercept waypoint) because the Flight Director is expected to capture and track the ILS glideslope and RNAV/VNAV guidance is no longer required.