The term 'placed a burden on' can be expressed in three different ways using the crossword solutions: LADED (5 letters), LADENED (7 letters), and TAXED (5 letters). Laded is a verb meaning to load or fill with a burden, while ladened is a past participle of the same verb. TAXED is a verb meaning to impose a burden or levy a charge. All three terms refer to the act of placing a burden on someone or something.