Riding on current refers to going with the flow or being carried along by circumstances or events. There are several synonyms for this phrase, such as being swept away, carried away, caught up in, or going with the tide. These all express the idea of being taken along by a force that is beyond one's control. Other similar phrases include being in the eye of the storm, going with the wind, and following the stream. All of these suggest a lack of resistance to the prevailing forces, and instead of trying to fight them, one simply allows themselves to be carried along.