chlebem

In a sentence

• Dzielimy się chlebem w dzień świąteczny.

  We share bread on the holiday.

  The word 'chlebem' is the instrumental case of 'chleb' (bread), showing means or accompaniment (sharing the bread).

• Karmię ptaki chlebem w parku.

  I feed the birds with bread in the park.

  Here 'chlebem' is used as an instrument for feeding the birds, indicating the material used in the action.

• Mój dziadek zawsze mówił o pracy chlebem powszednim.

  My grandfather always spoke about work as daily bread.

  'Chlebem' metaphorically refers to livelihood in this context, showing its figurative usage.