From Longman Business Dictionary
hoardinghoard·ing /ˈhɔːdɪŋˈhɔːr-/ noun1[uncountableU] when you collect and save large amounts of something in order to sell it later at a high price or because you think there might not be enough available in the futureThere has been an increase in cash hoarding ahead of the government’s proposed tax on interest income.
2[countableC] British EnglishBrEMARKETING a large sign used for advertisingSYN AmE billboard