The term 'CUT IN' can be defined as intruding, obtruding, slashing, or interrupting. INTRUDE is a 7 letter word meaning to enter without permission or welcome. OBTRUDE is also a 7 letter word meaning to thrust oneself forward or impose oneself upon others. SLASH is a 5 letter word meaning to cut or make a long, deep cut in something. INTERRUPT is a 9 letter word meaning to break into or cause a break in the continuity of something. All of these words describe the act of cutting in, which is when someone interrupts or intrudes on a situation without permission.