Performing an Action (Behind & Across)

to fail to keep up in work, studies, or performance

The company fell behind its competitors in AI research

to not succeed in doing something within the expected or required time limit

When a team member got behind on tasks, the rest of the group had to help catch up.

to develop or progress more slowly than someone or something else

American companies are lagging behind their Chinese counterparts in the development of artificial intelligence.

to leave without taking someone or something with one

The explorer left his trusty compass behind in the cave.

to be the true cause of something, often not immediately apparent

The search for power and control often lies behind manipulative behavior and toxic relationships.

to remain in a location while others depart

The brave firefighter stayed behind in the burning building to ensure everyone was safely evacuated.

to discover, meet, or find someone or something by accident

While cleaning out the attic, I came across an old box of photographs from my childhood.

to be clearly understood or communicated

The comedian's humor doesn't always get across to everyone in the audience.

to remain well-informed about a particular topic, subject, or situation

She likes to keep across scientific research to stay updated on breakthroughs.

to present information clearly and effectively to others

During his speech, the mayor put across the importance of community involvement.

to meet someone unexpectedly

I ran across an old friend from high school at the mall yesterday.