warn, advise, alert. Syn: warn, advise, alert. Ex: When the remaining two thirds of the vast open area are in production, 20 staff will harvest up to 1,000 kg of perhaps 35 different varieties of fruit and vegetables, every day. ‘We're not ever, obviously, going to feed the whole city this way,' cautions Hardy. ‘In the urban environment you're working with very significant practical constraints, clearly, on what you can do and where.